| 
      
        | Concentrations
of nHA | Time | 24 hours | 48 hours | 72 hours |  
        | 5 
           | 0.299 ± 0.005 | 0.295 ± 0.009 | 0.259 ± 0.007 |  
        | 10  | 0.306 ± 0.01 | 0.300 ± 0.005 | 0.267 ± 0.006 |  
        | 20  | 0.309 ± 0.002 | 0.297 ± 0.003 | 0.262 ± 0.002 |  
        | 30  | 0.298 ± 0.009 | 0.299 ± 0.009 | 0.256 ± 0.002 |  
        | 40  | 0.304 ± 0.004 | 0.295 ± 0.007 | 0.238 ± 0.002 |  
        | 50  | 0.308 ± 0.009 | 0.295 ± 0.005 | 0.236 ± 0.004 |  |